Re: OT, Chevy Lumina up and died!

Posted by KEB on April 28, 2006 at 11:10:27 from (192.31.106.34):

In Reply to: Re: OT, Chevy Lumina up and died! posted by 1991 Lumina 3.1 on April 28, 2006 at 08:29:18:

Like Bob says, the pressure regulator is on the return side of the fuel rail & with no vacuum connected pressure in the rail should be at the highest point. The fact that the pump will squirt a 2 ft stream only means that its producing adequate volume, not that it"ll produce the (as I seem to remember) 40 psi or so needed for the injectors to operate properly.

You really need to check the fuel pressure at the fuel rail. If it doesn"t come up to the specified value, plug the return line where it comes out of the regulator (squeezing the hose with a pair of vice grips generally works) & see if the pressure comes up. If the pressure comes to the right value when you close off the return line, the pump is OK & you probably have a bad regulator. If the pressure doesn"t come up to the spec"d value, then you have either a pump problem or a leak somewhere in the tank.

If you"ve replaced the pump, the prime suspect is the little rubber "pulsator" (I think that"s what its called) on top of the pump itself.

Keith

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